This certainly isn't the first time Eidos has been seen doing this. Earlier this year, the company was assumed to have pressured GameSpot into firing one of their executive editors by threatening to pull ad deals. This was in response to a negative review that GameSpot posted, which was retroactively edited afterward. Both companies denied the two events being related, however.
In this instance, a PR company for Eidos has outright admitted that they are trying to coerce sites into not posting negative reviews, at least not until after the game is actually released. They do not state that they would prevent reviewers from getting advance copies of the game, nor that they would be under obligation to pull a review if it was negative. Still, the implication here is pretty severe. Should a game developer or publisher even be involved in the review process at all?